The cabochon is an unfaceted, highly polished, cut gemstone, in which the top of the gem forms a dome-shaped or curved, convex surface. The base may be flat, convex, or concave. The girdle outline may be round, oval, square, triangular, polygonal, or any other fancy shape. Jade is a semi-precious gemstone, which is further classified into two categories named Jadeite and Nephrite. Jadeite is rarer than nephrite and is therefore regarded as more precious. Jade stones are found in green, lavender, red, yellow, white, and black colors with a translucent and waxy luster. In holistic healing and crystal therapy, light green Jade stones are considered to be a lucky stone that is associated with good health, wealth, and love. Being associated with the heart, Jade is useful to treat stress, anxiety, and disorders of blood circulation. Jade is mined in many locations around the world. Both jadeite and nephrite are found in Russia, China, and Guatemala. Nephrite deposits of varying quality have been discovered in both the Swiss Alps and New Zealand. Jadeite comes in a wide range of colors. The most valuable is an intense green called Imperial.